Happt Time factory assembly - No wonder these engines keep failing

I work on industrial equipment for a living. I have seen alot. I have seen seals "hammered" in place....I have seen them pressed in place. Failure rate was about the same. I was impressed that they gave him a real hammer, and did not make him use a stilson wrench left over from the previous production run.
 
It's refreshing to see that someone uses the correct methods of installation.

GearNut in quote: Yes, I also have screw jacks, pilot sleeves ,and proper seal drivers that match the screw jacks. It all really depends on the application.

There's only one thing missing from your methods and it's vital: a perfectly clean and expertly pressed white lab coat.
I wouldn't even think of rebuilding my bicycle engine or anyone else's without this critical item.
Besides, i can charge twice the labour rate with a white lab coat, and a few dial indicators strategically placed around the workshop.

Professionalism doesn't come at Walmart prices!
 
It's refreshing to see that someone uses the correct methods of installation.

GearNut in quote: Yes, I also have screw jacks, pilot sleeves ,and proper seal drivers that match the screw jacks. It all really depends on the application.

There's only one thing missing from your methods and it's vital: a perfectly clean and expertly pressed white lab coat.
I wouldn't even think of rebuilding my bicycle engine or anyone else's without this critical item.
Besides, i can charge twice the labour rate with a white lab coat, and a few dial indicators strategically placed around the workshop.

Professionalism doesn't come at Walmart prices!

If I wore one of those lab coats while working on Harleys (my profession) I would probably loose business! :eek: LOL!
 
Holy heck - now i understand why these 2-stroke chinese engines keep failing.

Bashing things into place with a hammer isn't exactly the correct assembly procedure.
I made up a jig that screws into the 6mm crankshaft thread that allows the helical crankshaft output gear to be evenly pressed into place.
I think that's why a good portion of these engines make so much gear noise - a slight amount of lateral movement is going to cause incorrect gear mesh.


http://www.youtube.com/watch?v=U6ZfkS20oYI
theres nothing wrong with what he's doing? thats how you replace the crank seal or initially place the crank seal in....its honestly not worth it to use a hydrolic press when you can place it in with 3-4 taps of the hammer....that's not bashing it into place lol.
 
umm if you call that bashing then i'd hate to see anything you put together. he was tapping the seal in with the seal driver (you'll notice him put the driver down towards the end)
 
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